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Pre-stack gather fidelity amplitude compensation optimization method

A pre-stack gather and amplitude compensation technology, applied in the field of geological exploration, can solve problems such as errors

Pending Publication Date: 2021-11-02
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to provide a pre-stack gather fidelity amplitude compensation optimization method that overcomes the technical defect of common imaging gather amplitude compensation that is easily affected by noise and produces errors in the prior art

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  • Pre-stack gather fidelity amplitude compensation optimization method

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Embodiment Construction

[0043] In order to make the above and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments are listed below and shown in the accompanying drawings in detail as follows.

[0044] like figure 1As shown, is a schematic diagram of the method for optimizing amplitude compensation of prestack gather fidelity of the present invention.

[0045] Step 1. For the pre-stack gather data E1, the incident angle and amplitude are substituted into the characteristic trinomial of the Zoeppritz equation to fit the parameters.

[0046] The technical flow chart of step 1 is as follows figure 2 shown.

[0047] 1. For the pre-stack gather data, evaluate the overall characteristics of the regional gather, and select the seismic trace range to be compensated for the offset (incident angle) according to the overall law of the region.

[0048] 2. Set the incident angle θ of the non-to-be-compensated seismic trace i and amplitude R'(θ i ) in...

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Abstract

The invention provides a pre-stack gather fidelity amplitude compensation optimization method. The method comprises the steps of substituting pre-stack gather data E1 into a Zobritz feature trinomial by using an incident angle and amplitude, and fitting parameters; substituting the parameters obtained by fitting into the feature trinomial expression to obtain a fitting gather E2, and performing fitting correction on the pre-stack gather data E1 to obtain corrected gather data E3; performing statistics on AVA overall characteristics of each well point in a work area, and performing full Zobritz equation forward modeling according to well point target layer speed and density data to obtain forward modeling gather data E4; and performing AVA amplitude compensation correction on the corrected gather data E3 in combination with the forward modeling gather data E4 according to a full Zobritz equation compensation correction functional expression considering time and offset direction to obtain final optimized gather data E5. According to the method, the AVA characteristic fidelity of the pre-stack gather is improved, the relation that the pre-stack amplitude changes along with the offset is kept, and a good data foundation is laid for subsequent full Zobritz equation inversion.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to a pre-stack gather fidelity amplitude compensation optimization method. Background technique [0002] Fidelity refers to the degree of agreement between the digitally processed seismic profile or data volume and the actual underground geological conditions, and improving the fidelity is all efforts or attempts to improve the degree of agreement. It mainly includes the following contents: [0003] (1) Model design in the process of forward modeling. The process of obtaining the seismic response of a given geological model is the forward modeling process. During this period, the design of the geological model involves the issue of fidelity. To improve the fidelity in this aspect, it is necessary to collect as much relevant data as possible, and design after comprehensive analysis. A forward modeling model that is consistent with the actual geological conditions is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30G01V1/28G01V1/40
CPCG01V1/307G01V1/282G01V1/40G01V2210/632
Inventor 代磊陈家昀赵华陈松莉张睿璇周子群苗永康
Owner CHINA PETROLEUM & CHEM CORP
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